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Significant Accounting Policies (Details)
 12 Months Ended
Dec. 31, 2011
Y
Significant Accounting Policies (Textual) [Abstract]  
Estimated useful lives of definite-lived intangible assets 5
Changes in assumptions and experience gains and losses greater than 10%
Period of benefit obligation in current liabilities next 12 months
Short term investments maturity period less than three months
Short term investments maturity period maximum 3 months
Buildings [Member] | Maximum [Member]
  
Property, Plant and Equipment [Line Items]  
Annual rates of depreciation on fixed assets 5.00%
Buildings [Member] | Minimum [Member]
  
Property, Plant and Equipment [Line Items]  
Annual rates of depreciation on fixed assets 2.50%
General purpose equipment [Member] | Maximum [Member]
  
Property, Plant and Equipment [Line Items]  
Annual rates of depreciation on fixed assets 10.00%
General purpose equipment [Member] | Minimum [Member]
  
Property, Plant and Equipment [Line Items]  
Annual rates of depreciation on fixed assets 7.00%
Special purpose equipment [Member] | Maximum [Member]
  
Property, Plant and Equipment [Line Items]  
Annual rates of depreciation on fixed assets 33.00%
Special purpose equipment [Member] | Minimum [Member]
  
Property, Plant and Equipment [Line Items]  
Annual rates of depreciation on fixed assets 10.00%